Method for recompression deformation of large and deep foundation and its engineering application

For large and deep foundation, the soils under the foundation base are in a state of compensation or overcompensation when the buildings are completed. The recompression deformation accounts for a large proportion in the final settlement. More attention should be paid to the calculation of rebound deformation and recompression deformation. The concepts of rebound proportion, reloading ratio, recompression ratio are proposed and applied in the analysis of the rebound deformation and recompression deformation. A relationship between the rebound deformation and the recompression deformation which is clearer and easy to calculation is created. The two-phase linear law of the recompression deformation is applied in the method for calculating the recompression deformation. So the recompression deformation under each reloading condition can be computed. Through engineering tests and calculation analysis, the results of the proposed method has better engineering practicability for the deformation control of projects.